NGC/IC Project Restoration Effort

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NGC3664

 

Basic Information


Location and Magnitude


Right Ascension: 11:24:24.4
Declination: +3:19:35
Constellation: LEO
Visual Magnitude: 12.8

Historic Information


Discoverer: Tempel
Year of discovery: 1879
Discovery aperture: 11.0

Observational


Summary description: pF, biN
Sub-type: SBm/P

Steve's Notes

===== NGC 3664 48" (5/12/12): This disrupted spiral was a fascinating sight in Jimi Lowrey's 48-inch. The brightest feature is a very knotty 1' irregular bar oriented SW-NE, containing at least three brighter knots. The brightest knot is at the northeast end with at least two very close knots on the southwest side. A very short offshoot extends just north of the northeast end. Fainter haze surrounds the bar on the NW and SE sides. The second brightest feature is a detached, mottled "arm segment" on the southwest side that's oddly cocked (NW-SE) perpendicular to the bar. As it appeared detached from the bar, it didn't seem like it was part of a spiral feature. But this arm segment dims significantly and continues curving clockwise around the south and east side, making a low surface brightness outer loop or ring, reaching around to the other side of the bar! Then I realized the bar was noticeably offset towards the northwest side within a rounder 1.6' outline. NGC 3664A, situated 6.2' south, is a much fainter disturbed companion that was likely involved in a train wreck with NGC 3664 during an earlier encounter. NGC 3664 is a 30" fairly low surface brightness glow with a broad concentration, but it didn't reveal any irregular structure. UGC 6417, a more challenging edge on, is another 5' further south. 17.5" (5/4/02): fairly large, low surface brightness glow with just a weak concentration, ~2' diameter. Nearly collinear with a wide pair of mag 10.5/12.5 stars 3' SE with a mag 10.5 star 7' NW also on this line. In addition, three mag 13 stars to the east are collinear! Located 20' W of a mag 6.7 star. This Arp galaxy has an unusual extension that juts at a 90¡ angle from the main body. 13.1" (4/10/86): very faint, slightly elongated ~N-S. Two stars lie SE and a bright star (82 Leo) is ~20' E.